<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-for</title>
</head>
<body>
    <div id="app">

        <input type="button" value="添加数据" @click="add">
        <input type="button" value="删除数据" @click="remove">
        <ul>
            <li v-for="(item,index) in arr">
                {{index+1}}中国城市:{{item}}
            </li>
        </ul>
        <h2 v-for="it in vegetables" v-bind:title="it.name">
            {{it.name}}
        </h2>
    </div>
<!-- 开发环境版本，包含了有帮助的命令行警告 -->
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
    var app = new Vue({
        el:"#app",
        data:{
            arr:["北京","上海","南京"],
            vegetables:[{name:"番茄炒蛋"},{name:"大肠"}]
        },
        methods:{
            add:function(){
                this.vegetables.push({name:"猪头肉"});
            },
            remove:function(){
                this.vegetables.shift()
            }
        }
    })
</script>
</body>
</html>